Sottnd-bepbodttcing unit



Dec. 10, 1929. P. s. ANDRES 7 'Re. 17,515

SOUND REPRODUCING UNIT Original Filed Dec. 18. 1926 Reina ed Dec. 10, 1929 f Re. 17,515

, UNITED STATES [PATENT OFFICE UNITED REPRODUCERS CORPORATION, OF ST. CHARLES, ILLINOIS, A GOBPORATION OI NEWJEBSEY BOUND-BEPBODUCHI G UNIT Original No. 1,655,408, dated Ianuary 10, 1928, Serial No. 155,600, fi1ed December 18, 1988. Application I for reissue filed September 14, 1928. Serial No. 306,017. I

The present invention relates to sound recies or periods so that at the frequency when produc or regenerating devices, such as one tends to become resonant, the other is rethose in radio-telephonic reception. mote from its resonant point. This allows Among the objects of the invention is to the total circuit to operate with a more uniprovide a novel device, preferably as a uniform load and output, or with an improved o ta means, for rendering sounds efliciently power factor. V an with substantiall uniform am litudes In a specific illustrative embodiment, the throughout the audi le voice an music deylce is m the 'form'of an electro-magnetic range of frequencies. unit. or structure adapted to operate two sets Another object of theinvention is to proof sound waves, as by means of a ho n a d a ide such a device with sound producers or d1aphragm,so interconnected electrically and sound emitting members regenerating units n series with given inductive reactances in having different natural periodicities such l-nverse ratio to the fundamental frequencies t that it may be high in,the case of the low freof the actuated sound producers, as to render 5 quency responsive unit, and below in the case the uniformity of final rendition and ampliof the high frequency responsive unit, thereby tudethereof, such device also preferably inavoiding marked resonance effects in the outcludin between the reactances, a capacity put of the device. To arrive at such results, shunt or by-passingthe high frequencies. the illustrative embodiment is disclosed with Other ob ects, features of the invention, 2 electrical inductances or coils arranged in a ap bllities and advantages are comprehendc5 filter circuit with one coi-l responding best ed by the invention as will later appear and to the low frequencies by reason of the high are inherently possessed thereby. impedance of .the inductance, and with an- R ferring to. the drawings, Fig. 1 is a other coil responding best to high frequentransverse sectlonal view through an illus- 25' cies by reason of the low impedance thereof. tratlve embodiment of the invention with E h i1 i d i d t t at a odu certain parts broken or shown in fragments. and preferably is connected in, series with Flg. 2 1s a schematic diagram of the power the other coil or coils, such that the inductive 1 reactances may be in inverse ratio to the fun- F 1g. 3 ma view showing an alternate mode 80 damental frequencies of the sound producers f c nectlng circuits.

or units. And, Fig. 4 is a diagrammatic'view of the Y The invention also may comprehend the cllclllts that may be used, shunting of a capacity, such as a condenser, Re erring nowmore in details to the draw. between the reactances or as a bypass f 1ngs, the embodiment selected to illustrate 85 the high frequency audio current for one the mvention 1s shown as comprising an or more of the coils, such that the high ca electro-magnetlc g n r ting system having pacity reactance of the condenser at low a P m n magnet 1 t0 the P0188 2 d 3 requencies may compel the low frequencies of w h aresecured polar members or shoes to pass through the other coil or coils, or the 4 and lg g Wlth 0011s solenoids 40 coi unit responsive to low frequency current. 6 and n rpolar member '8 being also In this way the response of each unit may be l d be ween the coils. matched to the total response desired to ob- Within the coils 6 and 7 are fulcrumed tain a'uniform response at allaudible frearmatures 9 and 10 with the armature 9 quencies, the units interacting electrically connected at one end thereof to an actuating 45 near or at their respective natural frequenmember or element 11 connected to a viings. In this arrangement of the circuit the bratable diaphragm 12 of a loud speaker horn 13 as clearly shown in Fig. 1 of the drawings. The outer endof the other armature is connected with an actuating element 14connected to the end of a vibratable element in the form of a reed 15 connected at its other end to the permanent magnet as indicated at 16 in Fig. l of the drawings. The reed 15 has a natural periodicity and at one of its loop points, such as (the point 17, is connected an actuating element 18 secured at its outer end to the apex of a cone 20 as clearly shown in the drawings. a

The cone is of the free edge type being connected at one or more points by a flexible conne'ctor 21 to bosses 22 provided on the inner surface of a rim portion 23 of an end casing member 24, the latter being suitably provided with means for supporting the same upon a support as desired. The member 24 has a side wall 25to which may be secured a base member 26 of the born, the latter havin' a threaded portion 27 secured to a, threa ed part of the member 26 and provided with suitable grooves with rings 28 for supporting and clamping the margins of the diaphragm 12 as clearly shown in the drawings. The coils are connected electrically in series through conductors 30 and 31, binding posts 32 and 33 suitably carried by the permanent magnet, and proceeding by leads 34 and 35 to the coils 6 and 7 and an interconnecting lead 36. as clearly shown in Figs. 2- and 3 of the drawings. Where the coils are of such value that it is desired that high frequencies will freely pass through one of the coils, such as the'coil 7, a co'ndenser'37 may be connected in shunt with the coil 6 so as to provide a path for the high frequencies without the efiect of the same being impressed upon or .felt as electro-motive energy in thecoil 6, yet

the condenser being of such a capacity that frequencies of low value will freely pass through the coil 6 to roduce its efiect upon the diaphragm 12. I the values of the coils bereversed depending upon the periodicities of the diaphragms 12 and 20, the condenser 37 may be placed in shunt with the coil 7, as clearly shown in Fig. 3, instead of in shunt with the coil 6 as shown in Fi 2 of the drawhigh frequencies will pass freely through the coil 6 and condenser 37 while the low frequencies will find a free path through the coil 7. v r

The diagram in Fig. 4 is to diagrammatically show the circuit in simplified form and the coils are alternately representative of coils 6 or? and 7 or 6 depending in which way the condenser is connected in shunt with respect to either one of the coils.

While I have herein described and upon the drawings shown an illustrative embodiment of the invention, it is to be understood that it may comprehend other forms, constructions, arrangements of parts and details without departing from the spirit thereof.

Having thus disclosed the. invention, I claim:

1. A sound regenerating device, comprising sound producers of different natural periods, and means for actuating said producers and comprising serially connected inductances having reactances in inverse ratio to the fundamental frequencies of the producers afiected thereby.

2. A sound regenerating device, comprising sound producersv of different natural periods, means for acluating said producers and comprising serially connected inductances having reactances in inverse ratio to the fundamental frequencies of the producers afiected thereb and capacity shunt means for by-passing high frequencies about the im ductance high in impedance to said high frequencies.

3. A sound regenerating device, compris-' ing sound producers of diiferent natural periods, means for actuating said producers ances. of said inductances varying inversely with resonances of said members,

6. A sound producing device, comprising sound emitting members having different resonance points and a unitary electro-magnetic means comprising serially .connected inductances for affecting said members, the reactances of said inductances varying inversely with resonances of said members, and a capacity shunt for one of said inductances.

7. A sound re enerating' device, comprising sound emitting diaphragmmatic mem bers, an amplifying means for one of said members, an electro-magnetm device for actuatmg sa1d members and com r1s1ng an 1nnetic devices having reluctances varying in- V versely. with said natural periods of said pr.0,

ductance for each of-said' mem ers and electrically connected serially, said inductances varying with the resonance characteristics of said members.

8. A sound regenerating device, comp'ri ing sound emitt ng diaphragmmatic members, an amplifying means for one of said m'embers, en electro-magnet'ic device fcr actuating said members and comprising an inductance for each of said members and electrically connected serially, said inductances var ing with the resonance characteristics of sai members, and a capacity shunt for one of said inductances.

In witness whereof, I hereunto subscribe my name to this specification.

PAUL G. ANDRES. 

